The purpose of this study is to confirm the effect of Eriqeron Breviscvps(EB), a Chinese medicinal herb, to speed up orthodontic tooth movement by means of biomechanic analysis. Ten cases, who had labioversion malposition of upper canines and had their upper first premolars extracted, were selected in this study. The upper canines and first molars of all cases had been placed standard orthodontic appliances which could force the canines to move distally. The gauze connected with positive electrode were touched at gingival area of the canines with right side infiltrated with solution of, EB and left side with distilled water served as control. The ion-introduction was performed every other week with direct current of 0.2mA and testing over 20min every time.The results showed there were significant differences in biomechanics of canines movement between two sides, with average velocity, acceleration and periodontal resistance in right canines being 0.168(mm/day),3.42×10-3(mm/day2)and 82. 60(g),and in control side being 0.099(mm/day),1.91×10-3(mm/day2)and 109.36(g).The study observed the mechanical characteristics of canines' movement which could quantitatively and scientifically prove that EB iontophoresis had a high ability to reconstruct periodontal tissues during the orthodontic tooth movement, which would lay the experimental foundation for applying EB into clinial practice.